That's a $200 bill (worth about $6 US). I got it in change today and it's the first one I've ever seen (the common denominations of paper money in Taiwan are $100, $500 and $1,000). That's Chiang Kai-shek on the front; the Presidential building in Taipei is on the reverse side.
I wonder why it is that governments mint or print certain denominations in such small quantities that most people seldom encounter them. Living in the United States, I hardly ever saw $2 bills, but the Mint must be printing enough every year to keep the (small) supply up. I wonder why the government doesn't either just discontinue it. or print enough so that they're circulated as much as the $1 and $5.